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Finding the Fourth Proportional to 145,637.70, 218,456.55 and 86,442.90

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Solution

The fourth proportional to 145,637.70, 218,456.55 and 86,442.90 is: 129,664.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,637.70 : 218,456.55 = 86,442.90 : x
  2. Step 2: Convert to fraction form
    145,637.70/218,456.55 = 86,442.90/x
  3. Step 3: Cross multiply
    145,637.70x = 218,456.55 × 86,442.90
  4. Step 4: Simplify right side
    145,637.70x = 18,884,017,706.00
  5. Step 5: Solve for x
    x = 18,884,017,706.00/145,637.70
  6. Step 6: Final answer
    x = 129,664.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.